The water seal is what keeps the smell out · review

kör4u plastic basin trap, 1 1/4 in × 32 mm, space-saving review

A ten-euro plastic trap that publishes both its sizes — 1 1/4 in in, 32 mm out — which is the pair that decides whether it connects at all.

By Jean-Benoit Buisson

The bottom line Both sizes published, cheap and chemically tough. Hide it inside a cabinet, and check your wall pipe is 32 mm first.

What you are getting

A plastic basin trap with a 1 1/4 in inlet and a 32 mm outlet, in a space-saving tubular form, whose lower part unscrews separately for cleaning, with no special tool required.

Two sizes, both published

1 1/4 in in. 32 mm out.

Those two numbers are the whole compatibility question: the inlet has to match your waste, and the outlet has to match the pipe in your wall. Publishing both is what lets the trap be ordered rather than tried.

Note the 32 mm only. If the pipe already in your wall is 40 mm, this needs a reducer.

The bottom that unscrews on its own

A blockage in a basin trap is hair and soap in the bend. If only the lower section comes off, you catch it in a bowl and screw it back. If the whole trap has to come down, you are disconnecting both ends over an open cupboard.

Where plastic wins

Drain cleaner. Caustic cleaner attacks metal traps from the inside over years and does nothing to polypropylene. A trap inside a cabinet is never seen, and inside a cabinet is where plastic is simply the better material.

The figure nobody gives

Water seal depth. Not one trap in this hub publishes it. It is the depth of water held in the bend, and it is what decides whether a fortnight away means smells on your return.

Availability

On sale from 10 € to 13 € on the German and French Amazon stores at the time of checking.

The Italian and Spanish Amazon listings are priced above 1.6× the cheapest store, which is normally a reshipping offer rather than a local price; they are left out of the range above.

Listed but with no offer on the British Amazon store — the reference exists there and nobody is currently selling it.

Not found on the American Amazon store, where the buy link falls back to a local search rather than to a page that does not exist.

Prices and availability are what Keepa reported on the date this page was updated; both move.

Prices quoted in this text were read on 5 September 2026. The live price is at the top of the page.

What we like, and what we don't

Strengths

Publishes both the inlet and the outlet — 1 1/4 in and 32 mm — so it can be checked against existing pipework
The lower part unscrews on its own, so a blockage is cleared without taking the whole trap down
Plastic resists the drain cleaners that eventually attack a metal trap from the inside

Compromises

32 mm only, with no 40 mm option stated — if your wall pipe is 40 mm you need an adapter
No water seal depth, like every trap in this hub
Plastic under a wall-hung basin is on show, and it will not stay white

Specifications

Inlet size	1 1/4 in — stated
Outlet size	32 mm — stated
Water seal depth	Not stated by the maker
Body type	Tubular, described as space-saving and fittable in tight positions
Space needed under the basin	Not stated as a figure — the body is stated to suit tight spaces
Material	Plastic, stated as resistant to corrosion and chemicals
Dismantles without tools	Yes — the lower part unscrews separately, with no special tool needed, stated
Amazon reference	B0C7V7WVVK (same reference on 5 Amazon marketplaces)
EAN	4260592561648

Questions people actually ask

Does plastic or metal last longer?

Plastic, generally, on the inside. Caustic drain cleaner attacks metal and does not touch polypropylene, and a plastic trap does not corrode at the seals. Metal wins on appearance, which only matters where the trap is visible.

What if my waste pipe is 40 mm?

This trap states a 32 mm outlet, so you would need a reducer. Two traps in this hub state a 32 to 40 mm range and fit either without one — worth choosing if you do not yet know what is in the wall.